In our Heavy Duty Gooseneck System, the goal and backboard are bolted directly to the post, forming a solid unit. All forces of slam dunking are safely absorbed by the heavy steel post, not the backboard. Adaptable to all rims including 4in x 4in and 5in x 5in bolt patterns. System includes: One piece 4-1/2in O.D. galvanized schedule 40 steel gooseneck post with your choice of a 4ft or 5ft extension. Limited lifetime guaranteed natural or powdered coated aluminum backboard. Available with 3 different rims. Nylon net also included.